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帮忙解释下这个段落的句子

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帮忙解释下这个段落的句子
In December,AIDS researchers announced findings about adult male circumcision.Two studies in Africa found that circumcised men had about half the risk of getting HIV from sex with women as uncircumcised men had.The studies took place in Kenya and Uganda
段落里的as uncircumcised men had 后面是不是省略了getting HIV from sex with women 这里的as可以换成than
句子最后的took place 的took
took place 发生
因为是说的比例问题,50%,所以用as
是的,省略了.